Lock



R. DE SEVO.

'LOCK.

APPLICATION FILED MAY I7, 1921.

1,420, l 86 Patented June 20, 1922,

2 SHEETS-SHEET I.

INVENTOR.

A TTORNE Y.

R. DESEVU.

LOCK.

APPLICATION FILED MAI/17,1921.

1,420, 186, Patented June 20,1922.

2 SHEETS-SH EET 2.

.33 57 J3 i ill S t WITNESS: INVENTOR.

ATTORNEY.

i vt o ui i, rs es u W riti-iam LOCK.

Lal-295186.

specification of Letters Patent.

Patented June 2u, i922.

application sied may ry, leal. sensi im.

To ZZ wlw/1t t may concern:

Be it known that l, RAPHAEL DE Sieve, a subject ol the King` ot taly, residing at Fast Longmeadow, in the county ot' Haino den and State ot liiassachusetts, United States of imerica, have invented a neu` and usel'ul Lock. ol which the Vliollowing,` is a specification.

lily invention relates to improvements 'in key locks tor doors and other objects which it is desired to secure with devices ot this characten and consists essentially olE a suitable case or casing, a boltoi'f special construction, which bolt is provided with auxiliary eccuring;` means in the torm of lat-ches, certain peculiar means whereby it is required to introduce tie key in an unusual manner in order to utilize, the same for ei!- tectualll operaring` the lock mechanism, and a plurality ot tumblers which are of peculiar construction, together with a key de signed and adapted ior successfully operating` said lock mechanism, and such other warts and. members as may be necessary or desirable in order to render the lock complete in eiery respect, all as hereinafter set forth.

The priniiary object o't my invention is produce an unusually strong` and sate lock. ot the character described, which is applicable for most purposes tor which loclfs ot such character are adapted, the saine being durable, comparatively simple in construction, not liable t get out of order`r and withal highly eliicient and serviceable.

.another object is to provide means, in a lock otI this kind, whereby one unfamiliar "with the same is unable to use the key tor throwing` the bolt either in or out ot engaging or loc une' position.

li lock construction is susceptible ot being` changed in such a manner that dit terent keys are required tor operating` dit` :terent locks, the changes usually required heine` made in the tumblers and in the Wards ot the key.I although sometimes a made in the bolt and in other keyeen`YA ging` parts, also in key-receivingl parts, as in other types ot tumbler and key another object is to provide a look with auxiliary means tor locking the bolt in projected position, to the end that an object secured by means ot said lock may be double lockechand `whereby an increased amount oit security is obtained.

This loclr is practically non-pickable, heini; rendered more especially so because of the presence therein ot the auxiliary locking `feature residingin the latches by means ot lwhich the bolt is itself locked, such lockingl means tor said bolt being` in addition to any securing` means therefor that are or may be afforded or provided by the tuinhlers.

@their objects and advantages will ai pear in course ot the following description.

A.. preierred embodiment oil my invention, u-hereby l attain the objects and secure the adifantages ot the saine, is illustrated in the accompauying` drawings, and l will proceed to describe the invention with reference to said drawings, although it is to be understood that the torni, oonstruo tion, arrangement, etc., ol.I the parte in various asyects are not material and may be modified without departure from the spirit oit the invention.

It to be understood that in di'liierent loc is the tumblers may be varied in nurnber, thickness, und form, and that the keys for ich locks must be made to tit the same.

ln' the drawings, in Which similar chari acters ot ret rence designate similar parts throughout the several views, Figure l is a iront elevation ot a lock which embodies a practical torni oit my intention as aforesaid, the iront plate having been removed, and the bolt being; in retracted position; hier 2, a sertie-al section through said lock, taken on lines 2 2, looking in the direction ot the associate arrow", in Fig. l; Fig. 3, a fragmentary detail oit the lock mechanisin, showing' the operation produced by the when properly inserted and turned to operate the tumblers, it being assumed that the key has made an i quarter turn, although a halt` turn in all; Fig, il, a vertical section through the look, on lines amil, looking in the direction ot the asso -rroyv, Fig. f5, showing the key in fragmentary detail, similar to that shown in Fig. 3, but showing the effect produced on the bolt and tumblers by giving the key another quarter turn; Fig. 6, another similar detail, but showing the bolt advanced to its full extent, and the latches thereon thrown out in operative position or engaging relative to the bolt-plate, this result being produced during the second operating revolution or1 key, or justbefore the latter completes one and one-halt operating revolutions, Fig. 7, a iront elevation of the rearmost tumbler; F ig. 8, a front elevation of the locking portion ot' the next tumbler; Fig. 9, a similar view ol the third tumbler from the rear; Fig. 10, a similar view of the foremost tumbler; Fig. 11, a front elevation, in partial section, or' the bolt, showing the latches with which said bolt is provided, and, Fig. 12, a side elevation,rin partial section, of the key which is required for thislock. v Although the locking operation has been mentioned above in connection with the operative and other views, they illustrate both the locking and the unlocking operations, as will hereinafter clearly appear.

In Fig. 6 l have shown a fragmentary portion oi a door at 1, and a fragmentary portion ot a door-casing at 3, with a part of a bolt-plate in section at 52. A boltreceiving opening or recess is represented Vat 5 in the door-casing 3, and a bolt-receiving slot at 6 in the bolt-plate 52. In this View that portion oi' the front, outer, or left-hand end ot the lock case or casing is shown in section, and there is a bolt-receiving slot 7 therein.

Necessarily a lock of this character must be provided with or consist in part or a case or casing, and the same is represented at 54;. The case 511 is designed to be attached to the door (l), or other object which it is desired to secure by means of the lock, with the exposed end ot said case at the outer edge of such door or other object-see Fig. 6. rllhe slotted portion ot the exposed end ot the case 5d is reinforced, as represented at 8. Said case consists in part ot a iront cover-plate 9, and there are two posts 10 projecting forwardly from the backside or" the case to assist in supporting said coverplate. The backside ot the case 54C is indicated by the numeral 32. The cover-plate 9 is secured to the case 541 and the posts 10 by any suitable means such as are usually found in lock-case construction. Extending rearwardly from the backside 32 of the case, adjacent to the center thereof, is a barrel 11, and projecting forwardly from the cover-plate 9, with its axis in line with the axis ot said barrel,

is a sleeve 12. A horizontal pin cr rod 13 has its rear terminal xed in the back end, which is closed, or the barrel 11, and said rod projects forwardly through said barrel, the case 5*-1, and the sleeve 12. A slot 14 is formed in the underside or t ie sleeve 12, said slot being parallel with the axis oi said sleeve, and a slot 15 is formed in the cover-plate 9 in the saine vertical plane with said first-named slot, and opens at the upper end into said first-named slot at the rear end thereof. The slots 1st and 15 torni the outer key-hole ot the lock, or the key-hole in the lock case.

Secured within the case 54K to the backside 32 is a vertical bridge-piece 16, A keyhole 1T is formed in the bridge-piece 16, which key-hole is at right-angles to the keyhole slot 15 in the cover-plate 9, said keyhole in the present instance extending to the Y right from the axial center cr the eye thereot, while said slot extends downwardly from the axial center of the key-hole of which said slot 'forms a part. rlhe rod 13 passes through the eye ot the key-hole 17, it being under-- stood that the axes or said eye, ot the sleeve 12, and said rod are all in the same straight line.

There is a guard 18 mounted on the rod 13, which is arranged and adapted normally to close the eye ot the key-hole 17, being held in closed position by means ci a spiralspring 19 which encirclessaid rod between the closed end of the barrel 11 and said guard. The edges ot the guard 18 and the eye of the key-hole 17 are so Jformed as to permit the former to close the latter without being Aforced forwardly clear through the same, and said guard is cupped on the backside to receive the spring 19. T he guard 18 is capable or sliding on the rod 13. Obviously a key, as 29, introduced in the keyhole formed by the slots 1iand 15 in the cover-plate 9, and guided by the rod 13, would come to rest against the guard 1S, and thus be prevented from entering the key-hole 17, unless su'liicient torce be exerted to overcome the resistance ot the spring 19 and torce said guard rearwardly on said rod. Thus it is seen that one unfamiliar with the construction of this lock, or with the manner in which the same is successfully operated, would merely insert the key in the casing 54 as far as the bridge-piece 16, and so tail to operate the lock mechanism in a manner to produce any desired result, as will presently more clearly appea lt may be observed here that the key 20 must be given a quarter turn to the lett, after being inserted in the case 541, in order to position or locate the tumblerand bolt-actuating members ot said key in registry with the keyhole 17, which is the rst step required in any operation ci' the lock, provided said key be out ci said lock. Until the aforesaid tumblerand bolt-actuating members of the key are in line with the key-hole 17, said key cannot, ol course, be pressed rearwardly to overcome the torce ot the sprin e* 19, displace the guard 18, and enter said key-hole, be-

readies cause while said members are in any other position the bridge-piece 16 presents an impenetrable obstacle to the further inward or rearward movement of the key on the rod 13.

Before proceeding further with the description of the lock, it is desired to call attention to the key 20 illustrated in Figs. 4 and 12. This key is the one required for the present construction and arrangement of the bolt, tumblers, and other parts of the lock, and is provided with wards 21, 22, 23, 24, and 25, said first-named ward being at the extreme inner end of the shank or barrel of the key, and said last-named ward being the most remote from such end. There is a slot 26 between the wards 21 and 22. The key 2O is also provided with a longitudinal passage 27 to receive the rod 13. Differently constructed keys are required for differently constructed locks, as herein previously observed.

Slidingly arranged within the bridgepiece 16 is a horizontal bolt 26 having a head 29 which is receivable in and operates through the slot 7 in the exposed edge of the case 54, and the slot 6 in the bolt-plate 52, and is receivable in the opening or recess 5 in the door-casing 3. The bolt 28 operates against the backside 32 of the case, and against the upper edge of the passage through the bridge-piece 16. Said bolt is further positioned and guided by the edges of the slot 7, and the edges of a longitudinal slot 30 in and adjacent to the right-hand terminal ofsaid bolt, into which slot a post or lug 31 projects from the backside 32, as clearly shown in Fig. 11. The bolt 28 is provided with a forwardlyextending pin, stud, or post 33, and is recessed in its lower edge, at 61--61, to form contacting surfaces 34, 35, 36, and 37, as is also clearly shown in the aforesaid view.

A vertical slot 38 extends through the head 29 of the bolt 28, and a pair of latches 39 is arranged within said slot. The heel of each latch 39 is pivoted at 40 to the bolt head 29, and such latch has an operating or actuating lug 41 which is adjacent to said pivot, and a locking lug 42 which is at the opposite or forward terminal of the latch. Flat springs 43-43 are arranged to bear at their free terminals on the lugs 41, the free ends of which lugs protrude at all times from the slot 38 above and below the bolt head 29. The springs 43 are above and below the bolt, and they have their other terminals wound on and secured to posts 44-44 which extend forwardly from the backside 32 of the case, said posts necessarily being above and below said bolt, as are said springs. Normally the springs 43, acting on and through the lugs 41, force the latches 39 toward each other and into contact at their free or forward ends, and on a line intermediate of the pivots 40 and perpendicular to a line drawn between said pivots, as best shown in Fig. 11. When the latches 29 are thus disposed the locking lugs 42 are wholly` within the slot 38, so that they in no way interfere with the free movement of the head 29 through the slots 7 and 6.

Arranged between the front side of the bridge-piece 16 and the backside 32 of the cover-plate, in the order named from back to front, are four tumblers 45, 46, 47, and' 48, and a filling-plate 49.

The tumblers 45, 46, 47 and 48 correspond in thickness with the thickness of the wards 22, 23, 24, and 25, respectively, of the key 20, and the width of the thickness of the thin portion of the bridge-piece 16 approximates the distance between the closed sides of the slot 26 in said key, while the thickness of the ward 21 is somewhat less; than the distance between the backside 32 and said thin portion of said bridge-piece.

In each of the aforesaid tumblers is a slot 50, and the tumblers are provided with lugs or stops 51, there being two such stops depending from the top of the slot in the tumbler 45, two depending from the top and two rising from the bottom of the slot in the tumbler 46, two rising from the bottom of the slot in the tumbler 47, and two depending from the top of the slot in the tumbler 48. The stops 51 extend into their respective slots 50, and the upper stops normally block the path of the post 33 which extends through said slots. There is also a slot 50 in the filling-plate 49. The slots 50 have a correspondence generally with each other in size and shape, and they are so arranged in their respective members as to enable them to be brought into approximate registry with each other. The spaced relationship of the stops 51 is prac` tically the same in each case, that is to say, the right-hand stops are in substantially the same transverse vertical plane, and the lefthand stops are in substantially the same transverse vertical plane. The stops with which each tumbler is provided are spaced from each other and from the ends of the slot into which they extend. There. is also a slot 53 in the bridge-piece 16, behind the slot 50 inthe tumbler 45. The slot 53 extends transversely of the bridgepiece 16, while the slots 50 in the tumblers and in the iilling-plate 49 extend longitudinally thereof.

The post 33 on the bolt 28 projects into ssy and through the slot 53 before entering the on or bears against the upper edgeroi' the slot 53, and thus assists thelug 31, which is in the slot 30 in said bolt, inguiding the latter. rl`he stroke of Ythe bolt 28 in both directions is also limited and determined by the ends of the slot'3O and the lug 31, said lug being in the left-hand end oit said slot when said bolt is in retracted position, and in the right-hand end of said slot when said bolt is in its most projected position.

The tumblers 45, 46, 47, and 48 and the filling-plate 49 are pivotally mounted at their right-hand ends on a stud 56 that projects forwardly from the backside 32 oit the case, and said tumblers and plate are pressed downwardly into normal Contact with the post 33, which extends through the slots in said members, by means of a plurality of springs 57, there being one such spring 'for each of said tumblers and tor said plate. Each spring 57 has one terminal secured to the oscillatory vmember actuated thereby, at a point below and to the le't't of the stud 56, as represented at 58, extends up over the right-hand edge or" such member, and then to the left far enough for the 'ree terminal of said spring to bear against the underside of theupper post 10. Thus the springs 57 have a constant tendency to swing the tumblers and the filling-plate 49 downwardly onn the stud 65, and the construction and arrangement of'parts are such that normally some of the stops 51, with which said tumd blers are provided, extend into and obstruct the )ath of the post 33, as previously stated.

aving described the construction of my lock, I will now explain in detail the manner in which the same is operated.

The key 2O is iirst inserted in the sleeve 12 and in the key-hole which comprises the slots 14 and 15, with the rod 33 in the pas sage 27, until said key encounters the guard 18. Now, if the key be inserted by a person unfamiliar with the construction or proper operation ot the lock, and said key be rotated in either direction, the wards of the key will, in the present case, act on the tumblers 45, 46, 47 and 48, and the lling-plate 49, bearing against the under edges thereof, and oscillate said tumblers and plate on the stud 56, without having any effect whatsoever on the bolt 28, such being the case whether said bolt be in retracted or in projected or advanced position. Y

Assuming that the person who has inserted the key 20 is experienced in the proper use of the lock, and that the bolt 28 is in retracted position, asin the irstview, said key is given a quarter turn to the lett while rearward pressure is exerted thereon, when the ward 21 comes into alignment with the key-hole 17, the spring 19 yields, and the key is forced further inwardly, carrying with itV the guard 18, until said ward is behind the thin part of the bridgepece 16, in

the space behind such part and the backside 32 or the case, when said key hasv imparted thereto a complete revolution, or at least a half revolution in the same direction, that is, to the left. The result produced by this rotary motion of the'key 20, after the ward 21 has entered behind the thin part ot the bridge-piece 16, is as follows: The first quarter revolution or' the key causes the tumblers 45, 46, 47 and 48 to be swung upwardly against the resiliency ofV their springs 57, to the extent necessary to remove suoli stops 51 as are in the path of the post 33 from such path, on the one hand, and not so tar as to interpose in such path the stops 51 that normally are out of the same, on the other hand. It is, in the present example, the depending stops 51 that must be removed from the path of the post 33, andthe other stops that must not be thrust into said path. The lock mechanism is now disposed as illustrated in Figs. 3 and 4, and the position of the wards of the key 20 is that indicated by dotted lines at 59 in Fig.- 3. During this operation the wards 22, 23, 24, and 25 pass into lcontact with the bottom edges of the tumblers 45, 46, 47, and 48, respectively.V The second quarter ,revolution of the key causes the ward 21 to contact with the surface 34 of the bolt 28, and to actuate said bolt to the left, and the other wards to pass out of contact with the tumblers. The ward 21 next passes out of contact with the bolt. The mech anism is at this. time disposed substantially as shown in Fig. 3,A with the wards of the key in the position indicated by the dotted lines 60 in that view. The head 29 of the bolt 28 is in locking position in the 'boltplate 52 and door-casing 3, and the tumblers have been actuated'by their springs 57 into contact with the post 33 again, but, inasmuch as the bolt 28 has been moved to the leit, said post is now between the upper lugs 51, as shown in Fig. 4, instead of between the right-hand upper lugs 51 and tlie'right-hand ends of the slots 50, as was the case in the first instance. The second half of the revolution of the key 2O is required, if it be desired to remove said key. In that event the key is permitted to be thrown forward, by the spring 19 and the guard 18, when the ward 25 arrives behind the key-hole 17, and then, if it be desired to withdraw the key from the lock, the same must be'given a quarter turn to the right in order to bring the wards in line with the key-hole slots 14 and 15. if the key be thus withdrawn it must be again inserted and pressed rea wardly into place, with the ward 21 beneath the bolt 28, for the purpose of either double locking the bolt or unlocking the same. `The operation is the same, after the key has been forced rearwardly into operative position the second time, as would be the case if it had not been removed, consequently the exineens@ planation following will be based on the assumption that the key has not been removed from the lock.

Starting, tl erefore, with the key in the lposition indicated by the dotted line 59 in Fig. 4, the key is given a half turn to the left to complete the first active revolution, and then said key is given a further half turn in the same direction, with the result that the bolt 2S is projected to its full eX- tent, and receives the benefit of the additional security afforded by the latches 39. The wards of the key are now in the position indicated by the numeral 62, and in approximately the same position as they were in Fig. 4, but have arrived there the second time. Due to the fact that, in order to throw the bolt into locking position and secure the same in such position with the latches 39, it is necessary to give the key two complete active revolutions, before the Vsame can be withdrawn from the lock, another half revolution of said key, from the position indicated at 62 in Fig. 6, still in the same direction, being` required to enable the key to be withdrawn from the key-hole 17, and then a quarter revolution in the other direction to enable the key to be withdrawn from the key-hole slots 14 and 15. The locking mechanism including the tumblers is now disposed as clearly shown in 6, with the bolt head 29 fully projected in the recess 5 in the door-casing 3, and the latch lugs or hooks 42 projected, outwardly in engagement above and below said head with the boltplate 52, so that it is impossible to actuate the bolt 28 inwardly and thus to unlock the door 1.

.Any rotary movement of the key 20, when the wards thereof are all in the space between the bridge-piece 16 and the coverplate 9, is considered as inactive or inoperative, since then no result is accomplished beyond the idle oscillation of the tumblers and filling-plate 49, which oscillation serves no useful purpose. lt is only when the key is so disposed as to enable the ward 21 to act on the bolt 28, when said key is rot-ated, that the rotation of the key is termed operative or inactive.

W'hen the second active revolution of the key is made, and before one-half of such revolution is complete, the wards 22, 23, 24, and 25 again act on the tumblers 45, 46, 47, and 48, respectively, to force them upwardly,

against the resiliency of their springs 57,`

and so to remove from the path of the post 33 the stops 5l which are in such path, and to open the way between all of the tumbler lugs for said post to pass to the left in the slots 53 and 50. This is during the irst quarter of the second active revolution. Then, during` the second quarter of the second active revolution, the ward 21 contacts with the surface 35 of the bolt 28 and .actuates said bolt still further to the left, or as far as it is capable of being moved in that direction, when said last-named ward passes clear of said surface, as it had previously passed clear of the surface 84. When this additional movement is thus imparted to the bolt 28, the lugs 4l at the inner ends of the latches 39 encounter the inner face of the reinforcement 8, and said latches are thereby rocked outwardly on the pivots 40 until the lugs 42 at the outer ends of said latches come into contact with the innerface of the bolt-plate 52 above and below the head 29. The latches 39 are at this time caused to separate at their free ends, and to thrust their lugs 42 out of the slot 38 and into engagement with the bolt-plate 52. This action on the part of the latches 39 is produced against the resiliency of the springs 43. The bolt head 29 is held very securely in locking position, by means of the latch lugs 42 and 41, so that the bolt can be forced in neither direction. The post is at the left of the left-hand set of upper tumbler stops 51, and, these parts would prevent the bolt 28 from being forced inwardly, even vwithout the aid of the latches 39, although not affording, of course, the same amount of security as is afforded by said latches, just as said post and the right-hand set of upper tumbler stops 51 prevent said bolt from beine` forced inwardly when said post is located between the leftand right-hand sets of tumbler stops.

1n unlocking the bolt 28, the key 2O is inserted in active or operative position as before, and then given two revolutions to the right, after which said key may be withdrawn, or it may be withdrawn, if desired, after giving the first revolution in its active or operative position, but then the bolt is only partially retracted and the door 1 is not unlocked. rl`he first operative revolution of the key disposes the tumblers in a manner to open the way to the right for the post 33, and the ward 21 bears on the operating surface S6 of the bolt 28 and moves said bolt to the right before passing clear of the same,VV

the bolt being moved to the extent 'illustrated in F 4. l/Vhen the bolt 28 rbegins to move to the right and to carry the pivots 40 inwardly, from the vicinity of the reinforcenient 8, the springs 43 begin at once to act on the latches 39 in such a manner as to cause the lugs 42 to be actuated, so that, by the time said bolt is disposed as shown in ,the aforesaid view, said latches are in initial position again with said lugs wholly within the slot 38, where they offer no obstruction to the passage of the bolt head 29 through the slot 6 in the bolt-plate 52. Upon the second operative or active revolution of the key, the tumblers are again manipulated and disposed so as to open the way for the passage of the post 8,3 to the extreme right-hand end 'of its travel, and the Ward 21 acts on and engages the surface 37 of the bolt and actuates said bolt to the right tar as the bolt can travel in that direction.' Then the key completes its second active revolution to the right, the parts are disposed once more as shovvn in F 1.

The spaces between the stops 51 in each pair oi upper and under stops, vvith which the tumbler 46 is provided, are Wide enough to permit the post 33 to pass When said lugs are disposed above and below the pat-h of said post.

Vhen the key 20 is in operative position and rotated, it does not act on the fillingplate 19, as it does when in inoperative position against the unseated guard 18 which is then pressed into the eye of the key-hole 17 by the spring 19. When the key is forced inwardly through the key-hole 17 into operative position., it bears on the guard 18 and thrusts the Same inwardly against the resiliency of the springs 19, and said guard and spring tend to retain the Ward Q1 in contact with the inner surface ot the thin part ot jthe bridge-piece 16. lil it be desired to retain the key in operative position while the Wards are passing the key-hole 17, it is necessary to exert pressure on said key to prevent the same from being thrust icorvcardly out of said position b y the spring- 19. No spring is required tor the bolt oit this lock.

It is understood, ot course, that, when thev key 2O is properly seated and turned in the lock, the relative proportions of the Wards 22, 23, E241-, and 25 to the tuinl'ilers e5, d6, 4?, and 18, the slots 50 therein, aud vthe stops 51 With which said tumblers provided, are suoli that the proper amountA oi displace ment is imparted to said tumbler-s to open a path for the post 33. A. key having incorrectly proportioned would tail to tuate all of the tumblers, or would not actuate them to the extent required to remove the upper stops 51 from the path of the post or would actuate them so iar as to project the under stops 5.1 intosueh path.

W hat 1 claim as my invention, and desire lto secure by Letters Patent, is-

1. The combination, in a lock, with a case provided With a iixed member, said case and member having key-holes therein, a keybplerated bolt in said case onone side ot said Fixed member, and aspring-pressed and key* operated tumbler 1n said case on the other .side of said member, said tumbler' being adapted normally to block the movement of Vsaid bolt, of a key. and yielding means nor- Vprovided vvith a .fixed member, said case and member havingkey-holes therein which are out of alignment Vwith each other, a key-opf erated bolt in said case on one side of said fixed member, and a spring-pressed and keyoperated tumbler in said case on the other side of said member, said tumbler being adapted normally to block the movement ot' said bolt, of a key, and yielding means normally to close the key-hole in said fixed members against the entrance of said key.

3. The combination, in a lock, with a case provided with a xed member, said case and member having key-holes therein, a key-operated bolt in said case on one side of said fixed member, and a spring-pressed and keyoperated tumbler in said case on the other side of said member, said tumbler being adapted normally to block the movement ot said bolt, of a key, and a springpressed guard in the case behind said fixed member, and in operative relation to the key-hole in said member, whereby said key is prevented from entering said last-named key-hole Without exerting pressure with the key.

fl. The combination, in a lock, of a case, provided with a xed rod, a sliding bolt in said case, a bridge-piece in said case over said bolt, said bridge-piece having a keyhole therein through Which said rod extends, `and a springspressed guard arranged on said .rod normally to close the entrance to said key-hole. Y

5. The combination, in a locln'ot a slotted case having an exterior slotted sleeve, the slots in said case and sleeve forming` a keyhole, a fixed rod projecting through said case into said sleeve, a sliding bolt in said case, a bridge-piece in said case over said bolt` said bridge-piece having a key-hole therein, and said rod passing through the eyes of both of said key-holes, and a springpressed guard arranged onsaid rod normally to close the eye of the key-hole in said bridge-piece. Y

6. The combination, in a lock, with a case, a key-operated bolt in said case, said bolt having a post, springpressed latches carried by the head of said bolt, and normally retained out of locking position,'said latches being provided with projections which are y adapted, vvhen said bolt is advanced, to contact With the case and throvv said latches into looting position, a plurality of spring pressed lslotted tumblers pivotally mounted Vin said case, said tumblenrs being provided Withtivo sets of stops, some of which stops extend and others are adapted to be actuated into the path or said post, and a slotted and key-hole-provided bridge-piecejbetvveen said bolt and tumblers, said post extending through the slot, in said. bridge-piece and .tumblers,' of a'ukey slotted to receive said bridge-piece, and having a Ward to engage Vand intermittently actuate saidV bolt, andV rangement of parts being such that Ymore`VY V 

